[Bug/Packaging] IIFE logs “Multiple instances of Three.js being imported” #91

Environment

• vim-web 1.0.0-alpha.0, IIFE build (dist/vim-web.iife.js) loaded via <script>
• API: VIM.Core.Webgl.createViewer() (headless, custom UI)
• Chromium / desktop, devicePixelRatio 1.75
• Model: 2,547 elements (2,264 with geometry), 12 Revit categories, structural

Summary. Loading dist/vim-web.iife.js prints three.js's multi-instance warning on every
page load:

WARNING: Multiple instances of Three.js being imported.

Likely cause. three appears to be bundled more than once (or a dependency bundles its own
copy) inside the IIFE rather than deduped to a single instance.

Impact. Beyond bundle size, multiple three instances can cause instanceof / material /
class-identity mismatches. (In our app VIM.THREE.Color worked for color overrides, so the
public VIM.THREE is at least the renderer's instance — but the warning suggests an internal
duplicate worth removing.)

Ask. Dedupe three to a single instance in the build (e.g. resolve/alias all three
imports to one copy).